Montessori Number rods.
If you can, build up to ten rods of alternating red and blue (or two other colors, but make sure the color scheme stays the same all the way through).Here is how to present the number rods: First, have the child build a stair with the rods.
After you have repeated the names a few times, you progress to the second period lesson and ask the child to point to 1, point to 2, point to 3.
Once he can do this, progress to the third period lesson. Point to a rod and ask the child to name it.
Once a child can do this with 1 to 3, repeat the process with the next three rods, until he has learned 1 through 10.This can be taught all on one day, or over a few days, depending on the child.
After the child can name all the rods, lay them out in random order on a mat and call a number for your child to find from the rods. Or lay them in random order, then choose a rod and ask your child to name it. Or lay them in random order and have your child choose a rod and name it.
The next step is to introduce the numerals and pair them with the number rod.